Full-Stack Developer — Delhi NCR
Portfolio — Vol. 01Cosmos Financial Group28.4089°N, 77.3178°E

VESHANTsinghDAHIYA

Full-stack developer engineering multi-tenant HRMS platforms & RAG-powered AI at Cosmos Financial Group. MERN, Python, and everything between idea and production.

See the work ↘Get in touch ↗
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React ✦Node.js ✦Python ✦FastAPI ✦Next.js ✦MongoDB ✦PostgreSQL ✦RAG Pipelines ✦TypeScript ✦AWS ✦Docker ✦PWA ✦
Build ✦Ship ✦Repeat ✦Build ✦Ship ✦Repeat ✦Build ✦Ship ✦Repeat ✦Build ✦Ship ✦Repeat ✦
( 02 )

About

I build production-grade systems for real people — from a multi-tenant HRMS serving 500+ employees to RAG-powered AI assistants answering 1,000+ queries a day.

✳

Allergic to social media, photographs & my own three-month-old code. Creating bugs since 2021 ;)

(Location)Faridabad — Delhi NCR, IN
(Role)Full-Stack Developer
(Company)Cosmos Financial Group
(Writing code since)2021
(Weapons)MERN · FastAPI · RAG · PWA / TWA
Currently building — Enterprise HRMS & AI HR Buddy
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Selected Work

(01) Live in production

Enterprise HRMS

multi-tenant, in production

HR platform serving multiple organizations — employee management, location-aware attendance, automated payroll, leave workflows and role-based access. Shipped to the Play Store as a PWA.

  • ✦ Multi-tenant architecture
  • ✦ Attendance with geo-tracking
  • ✦ Automated payroll processing
  • ✦ Leave management
  • ✦ Task report generation
  • ✦ PWA on Google Play Store
500+Daily users
5+Organizations
99.9%Uptime
ReactNode.jsMongoDBExpressPWAJWT
(02) Live in production

AI HR Buddy

RAG-powered, plugged into the HRMS

Retrieval-augmented chatbot answering HR queries in natural language — policies, payslips, leave balances — with live HRMS data, multilingual support and automated ticket creation.

  • ✦ Natural language understanding
  • ✦ RAG knowledge base
  • ✦ Real-time HRMS integration
  • ✦ Multi-lingual support
  • ✦ Context-aware responses
  • ✦ Automated ticket creation
1K+Queries / day
95%Accuracy
<2sResponse time
PythonFastAPIRAGLangChainOpenAIVector DB
There's more where that came fromGitHub ↗@xcress
( 04 )

The Stack

01

Languages

Expert

JavaScript · TypeScript · Python · HTML · CSS

02

Frontend

Expert

React · Next.js · Tailwind · PWA · TWA

03

Backend

Advanced

Node.js · Express · FastAPI · REST · WebSockets

04

Database

Advanced

MongoDB · PostgreSQL · Redis · Vector DB

05

AI / ML

Advanced

RAG · LangChain · OpenAI API · Prompt Engineering

06

Cloud & Ops

Solid

AWS · Docker · CI/CD · Linux

✳ 25+ technologies, one rule — if it ships to production, it counts.